MicW i436 on iphone 6 / iphone 6 Plus basedreal Time
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1 Technical Note 1501 MicW i436 on iphone 6 / iphone 6 Plus basedreal Time Analyzers (RTA) 1. Introduction With new iphone 6 and iphone 6 Plus being released in October 2014, the iphone based real time analyzer is becoming industrial standard measurement devices. MicW i436 microphone for iphonesthus becomes popular in the sound measurement community due to itsspecialty and compatibility. In thistechnical Notes, we will evaluate the performance of i436 on iphone 6 and iphone 6 Plus from following aspects: 1) Measurement Range 2) Calibration 3) Frequency Responses 4) Frequency Response Data Compensation 5) Applications and comparisons Fig. 1 iphone RTA system consists of iphone 6 (or 6+), i436 and APP software 2. Hardwareand Software The following hardwares and softwareswere used in the measurement: 1) MicW i436 microphones 2) iphone 6 (model A1549) 3) iphone 6 Plus (model A1524) 4) SigScopePro 4.4 (r1044) 3. Measurement Range The measurement range is the range of sound pressure levels that the iphonerta system can measure. 1 / 8
2 3.1 The minimum sound pressure level of the iphone 6 RTA system The iphone6 RTA system s minimum SPL was measured in BSWA anechoic chamber. The background noise level of the chamber is 16 dba. The measurements were taken at three Gain settings in the software Fig.2 Gain settings in the software Fig. 3 Measurements in anechoic chamber 3.2 The maximum sound pressure levels The maximum SPL of the iphone system was measuredby using BSWA high pressure calibrator CA905 which can generate 170 db sound sources in a small cavity. 2 / 8
3 Fig. 4 Setup for Maximum SPL testing. Thesignal starts to distort when the SPL reaches 130 db. 3.3 The results of measurement ranges at different Gain Settings The results are shown in Table 1. Software Gain Setting Minimum SPL (dba) Maximum SPL (db) Low Middle High Table 1 Measurement Ranges for Phone 6 based RTA with i Frequency Responses of iphone 6 based RTA with i436 The frequency responseswere tested in the BSWA anechoic chamber. The testing methodfollows standard IEC The final result is the average of 5 trials of tests using i436. The differences between iphone 6 and iphone 6 plus are smaller than 0.2dB. 3 / 8
4 Fig. 5 Measurement setup for testing the frequency response Frequency Response of iphone 6 and ipone 6 Plus with i436 microphone (Averaged Results) Sound Pressure Level (db) Frequency(Hz) Fig. 6 Frequency Responses for iphone 6 and iphone 6 + with i436 4 / 8
5 Upload the frequency response data to SigScopePro APP, and the APP has the function to compensate the measurement data. Fig. 5 Compensate Frequency Response Data to the APP Frequency (Hz) Corrections (db) Table 2 Frequency Response data for iphone 6 and iphone 6 + with i Calibration 5 / 8
6 To calibrate MicW i436, the app requires the sensitivity of i436microphonethat is already given in User s Manual. The unit of the sensitivity is mv/pa. The iphone 6 and iphone 6 Plus have internal amplification circuits, the amplification factor of iphones was measured by using BSWA CA114 Sound Level Calibrator (94.0 db at 1000 Hz) and resultis1.28. Fig 7. Sensitivity of the each i436 in User s Manual Steps to calibrate the iphone 6 based RTA: (1) Read the sensitivity value in User s Manual. Forexample, the sensitivity is 7.4 mv/pa in Fig. 7,. (2) Calculate the input sensitivity by multiplyingthe amplification factor 1.28 and sensitivity. Forexample, The Input Sensitivity = 7.4 x 1.28 = 9.47 mv/pa (3) Input (V/Pa) into APP as shown in Fig.8. (4) Press < on the upper right. Fig. 8 Input Sensitivity inapp 6 / 8
7 6. Applications [6] An independent study was conducted in University of Kentucky to compareipadmini based RTAwith i436andlms SCADAS system. The results are shown in Fig9 and Fig Sound Pressure Level (db) MicW + ipad mini PCB + SCADAS Frequency (Hz) Fig. 9 Comparison of ipad mini using i436 with LMS SCADAS using PCB microphone for white noise in the anechoic chamber. Sound Pressure Level (db) MicW + ipad mini PCB + SCADAS Frequency (Hz) Fig. 10 Comparison of ipad mini using i436 with LMS SCADAS using PCB microphone at 0.5 m from the exhaust of Hardy- Davis motorbike. References 7 / 8
8 [1] IEC : 1991, Measurement microphones - Part 1: Specifications for laboratory standard microphones [2] IEC : 1995, Measurement microphones - Part 4: Specifications for working standard microphones [3] IEC : 2004, Measurement microphones - Part 6: Electrostatic actuators for determination of frequency response [4] IEC , Electroacoustics- Sound Level Meters [5] IEC : 1991, Measurement microphones - Part 8:Methods for determining the free- field sensitivity of working standard microphones by comparison. [6] Gong Cheng and Ruimeng Wu, 2014, Data Acquisition for the ipad. Vibro- Acoustics Consortium Meeting, the University of Kentucky. 8 / 8
![[4] IEC 61672-1 2002, Electroacoustics- Sound Level Meters [5] IEC 61094-1: 1991, Measurement microphones - Part 8:Methods for determining the free- field sensitivity of](/docs-images/40/8657170/images/page_8.jpg "working standard microphones by comparison. [6] Gong Cheng and Ruimeng Wu, 2014, Data Acquisition for the ipad.")
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